Should I post here that a supposed Mewtwo form has been brought forth? ...Well. It hasn't been confirmed, but it's on posters for the Extremespeed Genesect! movie... not sure if this should go into Pokemon General Discussion, or if there's a thread for the movie. But if it's true, there's a new form for X/Y.
Proof on whether it's legit or not will probably come in the next CoroCoro.

Previously RedPanda.
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It's severely outdated, but I guess you can look at it if you want. (?)
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[19:42] Groosey: i thought I killed you! >:[